Electric drive system enhancement using a DC-DC converter

Active Publication Date: 2018-10-23
GM GLOBAL TECH OPERATIONS LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0003]An electric drive system and switching control method are disclosed herein, with the method intended to improve the overall operating efficiency of the electric drive system using a downsized direct-current/direct-current (DC-DC) converter. To ensure responsive operation at peak power, electric drive systems ordinarily will use a DC-DC

Problems solved by technology

It is recognized herein, however, that sizing of the converter to peak power may result in undesirable electrical losses within the converter and other components of the electric drive system.
For example, DC-DC converters include a relatively large

Method used

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  • Electric drive system enhancement using a DC-DC converter

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Example

[0020]The present disclosure is susceptible to various modifications and alternative forms, and some representative embodiments have been shown by way of example in the drawings and will be described in detail herein. It should be understood, however, that the novel aspects of this disclosure are not limited to the particular forms illustrated in the drawings. Rather, the disclosure is to cover all modifications, equivalents, permutations, combinations, sub-combinations, and alternatives falling within the spirit and scope of the disclosure as defined by the appended claims.

DETAILED DESCRIPTION

[0021]Referring to the drawings, wherein like reference numbers refer to like components throughout the several views, FIG. 1 depicts a schematic example vehicle 10 having a body 11 and an electric drive system 15. The vehicle 10 may be configured as a motor vehicle as shown, and therefore may be equipped with wheels 12 in rolling contact with a road surface 14. While the vehicle 10 of FIG. 1 ...

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Abstract

An electric drive system includes bus rails carrying a bus voltage, an energy storage system (ESS), and a power inverter. The system includes a voltage converter connected to the bus rails and having an inductor coil, semiconductor switches, a bypass switch connected to a positive bus rail, and a capacitor. A polyphase electric machine is electrically connected to the power inverter. A controller executes a method in which operation of the converter is regulated based on power, torque, and speed values of the electric machine. The converter is selectively bypassed by closing the bypass switch under predetermined high-power/high-torque conditions, with the bus voltage adjusted until it is equal to the battery output voltage. The bypass switch is opened and the bus voltage thereafter regulated to a predetermined voltage.

Description

INTRODUCTION[0001]An electric machine is capable of generating motor torque at levels useful for performing work, for instance in an electric drive system. When the electric drive system forms part of a powertrain of a hybrid or battery electric vehicle, the generated motor torque may be used to propel the vehicle. Alternatively, the torque provided by the electric machine may be used generate electricity. Electricity generated in excess of required amounts may be stored in a battery pack for later use.[0002]The electric machine is often embodied as a polyphase / alternating current device, and therefore electric drive systems may include a power inverter. A voltage output of the power inverter is controlled via the transmission of electronic gate signals to sets of semiconductor switches of the power inverter, e.g., pulse width modulation. During power generating modes, switching control of the power inverter converts the polyphase voltage from the electric machine into a direct curr...

Claims

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Application Information

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IPC IPC(8): G05B11/28H02P6/06B60K6/46H02M3/338H02K19/10H02K29/08H02K19/20
CPCH02P6/06H02K29/08H02K19/20H02M3/3381H02K19/103H02M3/338B60K6/46H02M3/1582H02P27/06Y02T10/92Y02T10/62
Inventor HAO, LEINAMUDURI, CHANDRA S.GOPALAKRISHNAN, SURESHNEHL, THOMAS W.
Owner GM GLOBAL TECH OPERATIONS LLC
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